Three-way call detector unit



FIG. 1 is a perspective view of a three-way call detector unit showing my new design;

FIG. 2 is a front elevational view of the three-way call detector unit;

FIG. 3 is a rear elevational view of the three-way call detector unit;

FIG. 4 is a right-hand side elevational view of the three-way call detector unit;

FIG. 5 is a left-hand side elevational view of three-way call detector unit;

FIG. 6 is a top plan view of the three-way call detector unit; and,

FIG. 7 is a bottom view of the three-way call detector unit.

The electrical cord has been shown broken away in FIGS. 3-7 for convenience of illustration. 

The ornamental design for a three-way call detector unit, as shown and described. 